OK, I am suffering from Cranial-Rectal Insertion.

I realized that I inadvertently changed something on the Speed tab in SF... Everything is back to normal and working just fine.

Now, to re-consider the upgrade to RH, even though the PF/SF combo DOES work for me, and I am pretty cozy with it.
I even learned about PF's "plating" functionality in the process.

Thanks Ian for pulling my head out of my butt.

There are a lot of benefits to using RH over PF.  Mainly easily rotate parts and do multiple parts easily.  Can select quite a few STLs to load all at once, then select autofit and bam, on the bed spaced out for you.  Plus 3d view of the g-code.

I realized that I inadvertently changed something on the Speed tab in SF... Everything is back to normal and working just fine.

Now, to re-consider the upgrade to RH, even though the PF/SF combo DOES work for me, and I am pretty cozy with it.
I even learned about PF's "plating" functionality in the process.

Thanks Ian for pulling my head out of my butt.

I un-installed everything, and I mean EVERYTHING, and re-installed Pronterface and Skeinforge again.

Now previously sliced gcode exports seem to print OK.

Now I am wondering if it was soemething with the STLs...

shoot me now.

I uninstalled RH and re-installed from solidoodle's website.   no better.
RH backs out the filament or runs like a snail - never extrudes...

I uninstalled and re-installed Pronterface from SD's website.
under PF, it's still the same...   

now I'm just annoyed and frustrated with this.

I decided to make the step to RH/Slicer.  Since then, I have been having problems left and right.  I know everyone seems to like RH, but it has been nothing but problems for me...  not printing, moving sloooooowly, and all sorts of other stuff.

So, I am back with Pronterface/SF.  Here is the current issue.

under manual control, the extruder will extrude and reverse filament just fine.
when I go to print, is seems the extruder motor is turning forwards/backwards rapidly, making a whole lot of racket in the process.  it does seem to be extruding, but it's not laying down nearly as much plastic as it normally should.

I tried adjust the Z home screw, so that there is a gap (1mm+) between the nozzle and the print surface, and it still makes the awful racket, and extrudes less plastic than it should.

When I watch the extruder wheel, I can see the set screw turning clockwise and counter-clockwise in rapid succession...

HELP!!!